With this you should have a basic idea how to setup internal routing.The procedure is the same on all OSes, the only thing that can be different is the syntaxfor the routing and how you setup secondary IPs.

NOTE: This is not a PRQ supported solution, i.e if you have problems with setting this up, we cannot help you. PRQ only support it on one computer per tunnel service. You are allowed to setup the solution above, but PRQ will not help you in case of a problem with the above solution. This guide is just setup to give you a overview of how to set it up.